Synfacts 2007(7): 0776-0776  
DOI: 10.1055/s-2007-968692
Polymer-Supported Synthesis
© Georg Thieme Verlag Stuttgart · New York

Montmorillonite-Entrapped Sub-Nanoordered Palladium Clusters

Contributor(s): Yasuhiro Uozumi, Yohei Oe
T. Mitsudome, K. Nose, K. Mori, T. Mizugaki, K. Ebitani, K. Jitsukawa, K. Kaneda
Osaka University and Nagoya Institute of Technology, Japan
Further Information

Publication History

Publication Date:
22 June 2007 (online)

Significance

A montmorillonite (mont)-entrapped sub-nanoordered Pd cluster as a hetero­geneous catalyst for allylic substitution reactions was developed. Thus, ion-exchange reaction of Na+-mont with an aqueous solution of Ca(OH)2, followed by treatment of the resulting Ca2+-mont with a solution of Pd(dba)2 gave a Pd(II)-mont. Reduction of the Pd(II)-mont with KBH4 afforded the Pd clusters entrapped within the mont (Pd-mont) (eq. 1). The size of the Pd clusters was estimated to be 0.57-0.82 nm. The allylic substitution reaction of allyl methyl carbonate with ethyl acetoacetate was carried out in the presence of the Pd-mont catalyst to give the allylic substitution product in 93% yield (eq. 2).